Motor fuel



' basic hydroxy acids such as malic and tartaric Wuteuled or. 2, 19351,995,615 Moron FUEL No Drawing. Application September 1, 1931,

Serial No. 560,665

3 Claims. (Cl. 44-9) This invention relates to motor fuels and more tailin connection with the following specific particularly to motor fuelscontaining gumexamples:

forming unsaturated compounds such as, for ex- Exam le 1 ample, crackedgasoline. These fuels are highly p desirable because of their excellentanti-knock 2-6 pounds of Pentasol acetate are mixed 5 properties, butthe tendency to form a colored with 100 barrels of cracked gasoline,producing gum, especially under the influence of sunlight, a-wellstabilized product.

renders them objectionable particularly where Example 2 they are sold inthe so-called visible dispensing pumps and are subject to the action ofsunlight. /zpounds 1 m hyl nthrflnllate are added 10 It has beenproposed to stabilize the fuel by to 100 barrels of cracked gasoline,producing a the-addition of components which tend to pre m I fu of 11ili yvent the formation of the colored gums. In the Example 3 past, twosuch stabilizers have been described,

1!; namely, anthracene, phenanthrene and phenols /2 pounds of ylphthalate are mixed 15 and acid amines of aromatic amines such as with100 barrels of cked gasoline, resulting in acctanilide. I have foundthat esters of cara Well stabilized motor fuel. boxylic acids are goodstabilizers. While the Example 4 lower molecular esters such as estersof fatty acids may be used with effect, the esters oi higher Pounds ofethyl bemoylbenzoate are added as molecular acidsand particularlypolybaslc acids to 100 barrels of asoline, esultin in a product and ketoaromatic acids are preferable. of satisfactory stability.

Among the esters of aliphatic acids are the Example 5 alwl esters offormic, acetic, propionic, butyric,

26 etc., particularly esters of the higher alcohols M r n f dlmethylmaleate are added as such as t butyl and mi t including the to 100barrels of gasoline. A well stabilized gasoesters from the mixed amylalcohols obtained by line is 013158111941- the hydrolysis of chlorinatedpentanes from nat- 7 Example 6 v ural gas and sold on the market underthe name 24 pounds of methyl pymmucate are mixed w of Pentasol. Glycerinesters are less eflective t 10 barrels of 395011116, thorgughly m...than the esters of mono and dihydric alcohols but bilized product beingobtained.

are included in the invention in its broader aspects. Example 7 A veryefiective class of aliphatic esters are 3-5 pounds of benzylbenzoate areadded to loll 35 those 0! the dibaa 1 11 1 8 x lfi. m l i barrels ofgasoline. A product of satisfactory fumaric, succinic, tartaric, citric,adipic, stability is obtained.

etc.

The esters of aromatic acids are very desirable, Example 8 40particularly the phthalates, benzoates and esters A ixture of 2 to 6pounds of diethyl of the ketc aromatic acids such as benz yl phthalateand urea are added to 100 barrels oi zoate, naphthoylbenzoate, and theirsubstitution oline, producing a well stabilized product. products;Esters of amino substituted aromatic acidsare particularly eflective,for example esters Example 9 of aminophthalic, anthranilic,para-aminoben A mixture of 3-5V pounds of butyl naphthoyl- 45 zoic,aminonaphthoic, etc. benzoate and acetanilide are mixed with 100 bar-Esters of hydroxy acids are also useful, such rels of gasoline,resulting in a well stabilized as lactates, salicylates, and the likeand the dimotor fuel.

referred to above. Example 10 Another group of esters are those of thehetero- 2-5 pounds of a mixture of ethyl ester of 2- cyclic acids suchas pyromucic, various pyridine phenyl quinolin d-carboxylic acid andanthraand quinolin carboxylic acids, and the like. I cene are added to100 barrels of gasoline. A The invention will be described in greaterdeproduct of satisfactory stability is obtained. as

it will be apparent from the examples that not only can the esters ofcarboxylic acids be used alone, but they may be used in conjunction withother stabilizers of difierent types. Naturally, of course, a pluralityof esters of carboxylic acids may be used.

While it is normally desirable to use as little stabilizer as possibleand the examples show amounts of stabilizer on the order of a fewhundredths of a percent, larger amounts of stabilizer may, of course, beused, without any harm, but practically the amount of stabilizer neverneed exceed 1% and preferably the amount used is from .01% to 1%.

